Education Technology

# Activities

• ##### Subject Area

• Math: Elementary Math: Number Sense and Estimation
• Math: Elementary Math: Geometry

K-5

60 Minutes

• ##### Device
• TI-15 Explorer™
• ##### Other Materials
This is Activity 13 from the EXPLORATIONS Book:
A World of Mathematics: Activities for Grades 4, 5, and 6 Using the TI-15

The following materials are required for this activity:
• Drawing of the Lay Family Concert Organ
• Rulers

Yards of Tin

#### Activity Overview

Students solve a problem involving surface area of cylinders. They find the surface area and the amount of tin needed to make the cylindrical parts of ten long open pipes.

#### Before the Activity

• See the attached PDF file for detailed instructions for this activity
• Print pages 78 - 86 from the attached PDF file for your class
• Review the four steps of problem solving with students
• #### During the Activity

Distribute the pages to the class.

• Read the problem and understand the dimensions of the ten longest pipes in the concert organ
• Cut a cardboard or paper towel cylinder along its height to form a rectangle
• Relate the surface area of the cylinder to the area of a rectangle
• Find the scale of the drawing that shows the length and the width of the concert organ pipes
• Find the height, diameter, and circumference of the ten longest pipes
• Calculate the surface area and the square footage of tin needed to make the cylindrical part of the pipes
• Create a chart with the details of the height, diameter, circumference, and surface area of the pipes
• Write an explanation about the solution

• Finding surface area
• Solve problems involving calculation of surface area of cubes and open cylinders
• #### After the Activity

Students examine the various solutions presented.

• Review student results
• As a class, discuss questions that appeared to be more challenging
• Re-teach concepts as necessary